Review on recent progress in Al-Mg-Si 6xxx conductor alloys

The mechanical strength and electrical conductivity (EC) in Al-Mg-Si 6xxx conductor alloys are key characteristics but mutually exclusive properties. This review paper critically elaborates the methods to enhance the mechanical strength and electrical conductivity.These methods include an optimization of the main alloying elements (Mg and Si), the addition of the other alloying elements, melt treatment, applying the modified thermomechanical treatments, and maximizing the area reduction (severe plastic deformation) in the wire drawing. Besides, the impact of the various microstructural features on the mechanical and electrical properties is addressed in detail using strength and electrical resistivity models. A principal conclusion drawn in this review is that the strength ought to be enhanced by creating barriers (such as sessile dislocations and precipitates) for dislocation movement while having a less detrimental effect on the electrical conductivity. Considering the potential of Al-Mg-Si conductor alloys, future directions are outlined.